What Is Causing Blue Spots On Crackle Ceramic Vases

Bacteria stains are more likely to occur on earthenware or stoneware type pottery due to the ceramic higher porosity level allowing the moisture to penetrate deeper and stay wet creating perfect enjoyment for bacteria to flourish.

What is causing blue spots on crackle ceramic vases.

Celadon is a term for pottery denoting both wares glazed in the jade green celadon color also known as greenware the term specialists now tend to use and a type of transparent glaze often with small cracks that was first used on greenware but later used on other porcelains celadon originated in china though the term is purely european and notable kilns such as the longquan kiln in. Use as a vase to display single stems or as a decorative piece on its own. Glazes are a very thin coating so most will craze quite easily. High fire ceramic such as porcelain which has almost no porosity will less likely stain.

A characteristic of 15th century blue and white porcelain for example was the so called heaped and piled effect in which the cobalt blue underglaze was concentrated in certain areas bubbling through the surface of the glaze and turning a deep blue black. The cause of crazing is the glaze being put under too much tension. The stoneware vase features a crackle glaze for a subtle distressed look which complements the matte finish stone bottom beautifully. The tension happens when the glaze contracts more than the clay body does when cooling after being in the kiln.

On rare occasions these may be larger but mostly they appear as tiny spots. Measures 6 5 h x 4 75 w. This decorative element changed a lot over the centuries.